<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>canvasCanTouch</title>
  <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  <link rel="stylesheet" href="./demo3.css">
</head>
<body>
  <canvas id='canvas' width=300 height=300></canvas>
  <div id="actions" class="actions">
    <button id='eraser'>橡皮擦</button>
    <button id='brush'>画笔</button>
  </div>
  <script src="./demo3.js"></script>
</body>
</html>